Category
page 1Intersection
intersection
concept in set theory (for the term in geometry, see Q1364910)
sunflower
collection of sets in which every two sets have the same intersection
Erdős–Ko–Rado theorem
theorem on the maximum size of a family of pairwise intersecting sets
intersection
220px|thumb|The intersection (red) of two disks (white and red with black boundaries).
thumb|right|The circle (black) intersects the line (purple) in two points (red). The disk (yellow) intersects the line in the [[line segment between the two red points.]]
220px|thumb|The intersection of D and E is shown in grayish purple. The intersection of A with any of B, C, D, or E is the empty set.